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WorksheetsRedox Reaction
Total questions: 15
Worksheet time: 16mins
Name
Class
Date
1.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
2.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
3.
A chemical reaction that involves a gain/loss of electrons is called:
a)
Double Replacement
b)
Neutralization
c)
Oxidation-Reduction
d)
Hydrolysis
4.
The sum of all oxidation numbers in a neutral compound is ___.
a)
0
b)
1
c)
-1
d)
depends on the compound
5.
What is the meaning of reduction?
a)
Gain of electron
b)
Gain of oxygen
c)
Loss of hydrogen
d)
Increase in oxidation number
6.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
7.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
8.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1
9.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
10.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
11.
In the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?
which element, if any, is oxidized?
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
12.
Is calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O2
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
13.
Reduction is the ___________ of electrons.
a)
loss
b)
gain
c)
sharing
d)
transfer
14.
Which of the following represents oxidation?
a)
C → CH4
b)
Fe3+ → Fe2+
c)
Cl2 → 2Cl-
d)
Zn → ZnO
15.
The following chemical equation represents the extraction of silicon from quartz using coke.
SiO2 + C → Si + CO2
What is the change in oxidation number of silicon?
a)
+2 to 0
b)
+4 to 0
c)
0 to +2
d)
0 to +4
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